| 501 | JBSX | Jay B.S. Corp. | added 7/1958; eliminated 10/1959 | | NAKINA |
| 502 | JBSX | James B. Shatto Co., Inc. | added 1/1958; eliminated 7/1958 | | NAKINA |
| 503 | JBSX | James B. Shatto Co., Inc. | added 1/58; eliminated 7/58 | | NRHS |
| 504 | JBSX | Jay B.S. Corp. | added 7/58; eliminated 10/59 | | NRHS |
| 505 | JBSX | JAY B.S. CORP. [JAMES B. SHATTO CO.] | | | PWRC |
| 506 | JBSY | JBS CARRIERS | | | SCAC4 |
| 507 | JBTB | JONES BROS TOWING & TRUCKING INC | | | SCAC4 |
| 508 | JBTD | J B TRANSPORTATION INC | | | SCAC4 |
| 509 | JBTE | JESSUP, BERT E | | | SCAC1 |
| 510 | JBTH | J & B TRUCKING | | | SCAC4 |
| 511 | JBTI | J B TRUCKING | | | SCAC4 |
| 512 | JBTJ | JUAREZ BROTHERS TRUCKING | | | SCAC4 |
| 513 | JBTK | J B C TRUCKING | | | SCAC4 |
| 514 | JBTL | JBT EXPRESS LTD | | | SCAC4 |
| 515 | JBTN | JOE BEAR TRUCKING INC | | | SCAC4 |
| 516 | JBTO | J B TRANSPORT | | | SCAC4 |
| 517 | JBTP | J & B TRUCKING INC | | | SCAC4 |
| 518 | JBTQ | JONES-BEYS TRUCKING LLC | | | SCAC4 |
| 519 | JBTS | JBT SERVICE INC | | | SCAC4 |
| 520 | JBTU | L&T C.V. | | NL | BIC |
| 521 | JBTU | JUMBOTAINER BV BARENDECHT | | | PWRC |
| 522 | JBTU | Jumbotainer BV Barendecht | | | RSRV |
| 523 | JBTU | JUMBOTAINERS | | | SCAC4 |
| 524 | JBTV | J B TRUCKING | | | SCAC4 |
| 525 | JBTW | JACKSON, BILLY TRUCKING | | | SCAC4 |
| 526 | JBTY | JB TRUCKING INC | | | SCAC4 |
| 527 | JBU | Jetblue Airways Corporation | IATA: B6, Callsign: Jetblue, IATA Prefix: 279, | USA | AVCODES |
| 528 | JBU | JetBlue Airways | IATA: B6 | | ICAO1 |
| 529 | JBUG | J B UGLAND SHIPPING SINGAPORE PTE L | | | SCAC4 |
| 530 | JBUM | JUST BUMPERS | | | SCAC4 |
| 531 | JBUS | JACOBUS ENERGY INC | | | SCAC4 |
| 532 | JBV | Jernbaneverket | | N | TRAFFIC |
| 533 | JBV | Jernbaneverket | | NO | VKM |
| 534 | JBW | Jubba Airways (K) Limited | IATA: 6J, Callsign: Airjub, | EAK | AVCODES |
| 535 | JBW | Jubba Airways (K) Limited | IATA: JZ, Callsign: Airjub, Designator 6J recalled by IATA | EAK | AVCODES |
| 536 | JBWI | JBW LOGISTICS INC | | | SCAC4 |
| 537 | JBWL | JOHNSON BROTHERS LIQUOR COMPANY | | | SCAC4 |
| 538 | JBWQ | JOBBERS MOVING & STORAGE CO | | | SCAC4 |
| 539 | JBWT | J B WEST TRUCKING & CO | | | SCAC4 |
| 540 | JBX | John Brennan & Co. | 8/1920 | | NAKINA |
| 541 | JBX | JOHN BRENNAN & CO. | | | PWRC |
| 542 | JBXC | JARAMILLO BROTHERS TRANSPORTATION C | | | SCAC4 |
| 543 | JBXD | J B TRANSPORT INC | | | SCAC4 |
| 544 | JBXE | JB EXPRESS INC | | | SCAC4 |
| 545 | JBXI | J & B EXPRESS INCORPORATED | | | SCAC4 |
| 546 | JBXL | JBT TRANSPORT LTD | | | SCAC4 |
| 547 | JBXN | JANJUA BROTHERS TRANSPORT INC | | | SCAC4 |
| 548 | JBXO | JOBS TRANSPORT INC | | | SCAC4 |
| 549 | JBXQ | J B EXPRESS LLC | | | SCAC4 |
| 550 | JBXR | JBS EXPRESS, INC | | | SCAC1 |
| 551 | JBXS | J B EXPRESS INC | | | SCAC4 |
| 552 | JBXT | J B TRANSPORT | | | SCAC4 |
| 553 | JBYE | JACKSON, BO | | | SCAC4 |
| 554 | JBYS | JB'S TOYS | | | SCAC4 |
| 555 | JC | JAL Express | ICAO: JEX, Callsign: Janex, IATA Prefix: 688, Merged to Japan Airlines w.e.f. 30 September 2014. | J | AVCODES |
| 556 | JC | Rocky Mountain Airways | ICAO: RMA, Callsign: Rocky Mountain, Merged into Britt Airways to form Continental Express during 1991. Founded in 1963. Commenced operations in 1965. | USA | AVCODES |
| 557 | JC | Jamair Company Ltd. | Callsign: Jamair, Ceased Operations | IND | AVCODES |
| 558 | JC | All Seasons Aviation Limited | ICAO: ASG, Callsign: All Seasons, | GB | AVCODES |
| 559 | JC | Japan Air Commuter Co. Ltd. | ICAO: JAC, Callsign: Commuter, IATA designator changed from 3X. | J | AVCODES |
| 560 | JC | Jura-Cement-Fabriken | | CH | VKM |
| 561 | JCA | Jetcom SA | Callsign: Jetcom, | CH | AVCODES |
| 562 | JCA | Jetcontact Luftfahrtbetriebs und Vermittlungs GmbH | Callsign: Jetjaco, | A | AVCODES |
| 563 | JCA | Jet Power Aruba Charters & Transportation Company V.B.A. | Callsign: Spartan, | ARU | AVCODES |
| 564 | JCAB | Japan Civil Aviation Bureau | | J | TRAFFIC |
| 565 | JCAE | J C TRUCKING | | | SCAC4 |
| 566 | JCAK | JCA TRUCKING | | | SCAC4 |
| 567 | JCAO | JCK TRANSPORTATION INC | | | SCAC4 |
| 568 | JCB | J C Bamford Excavators Ltd. | Callsign: JayCeeBee, | GB | AVCODES |
| 569 | JCB | J C Bamford (Excavators) | | | ICAO1 |
| 570 | JCBE | JACOB EXPRESS | | | SCAC4 |
| 571 | JCBF | JACOBSON TRANSFER | | | SCAC4 |
| 572 | JCBH | JCB TRANSPORTATION INC | | | SCAC4 |
| 573 | JCBK | JBCI TRUCKING INC | | | SCAC4 |
| 574 | JCBN | JCB TRANSPORTATION LLC | | | SCAC4 |
| 575 | JCBO | JACOBS, MARK TRANSPORTATION | | | SCAC4 |
| 576 | JCBP | J C B TRANSPORT INC | | | SCAC4 |
| 577 | JCBQ | JENSEN CUSTOMS BROKERS CANADA INC | | | SCAC4 |
| 578 | JCBR | JEFFERSON & CYPRESS BAYOU RAILROAD | | | PWRC |
| 579 | JCBS | JACOBS, TIM | | | SCAC4 |
| 580 | JCBU | CARLSBERG DANMARK A/S | | | SCAC4 |
| 581 | JCBY | JACKSON, MARSHA M | | | SCAC4 |
| 582 | JCC | Jetcraft Aviation | Callsign: Jetcraft, | AUS | AVCODES |
| 583 | JCC | JC (Cambodia) International Airlines | IATA: QD, Callsign: Cambo, Planned startup subject to licence approval in April 2017. | K | AVCODES |
| 584 | JCC | Jetcraft Aviation | | | ICAO1 |
| 585 | JCCB | JESUS CHRIST CARRIERS LLC | | | SCAC4 |
| 586 | JCCC | JOYCE CAR CARRIER CORPORATION | | | SCAC4 |
| 587 | JCCD | JONES, C C PRODUCE TRUCKING | | | SCAC4 |
| 588 | JCCF | JEMA CARGO COMPANIES INC | | | SCAC4 |
| 589 | JCCH | JRS CONTRACTING CO INC | | | SCAC4 |
| 590 | JCCL | JIF LOGISTICS INC | | | SCAC4 |
| 591 | JCCM | COLEGRAVE CONTAINER LEASE MANAGEMEN | | | SCAC3 |
| 592 | JCCM | JCC TRANSPORT | | | SCAC4 |
| 593 | JCCR | JETCLUB CARGO | | | SCAC4 |
| 594 | JCCV | J & C CUSTOM DELIVERIES INC | | | SCAC4 |
| 595 | JCCX | JEFFERSON CHEMICAL CO. | | | PWRC |
| 596 | JCDB | JOHNSON CONOCO DISTRIBUTORS INC | | | SCAC4 |
| 597 | JCDX | Jefferson County Drainage District No. 6 | 7/2005 (not listed) | | NAKINA |
| 598 | JCDX | JEFFERSON COUNTY DRAINAGE DISTRICT NO. 6 | | | PWRC |
| 599 | JCDX | Jefferson County Drainage District No. 6 | | | RSRV |
| 600 | JCDX | JEFFERSON COUNTY DRAINAGE DISTRICT | | | SCAC4 |
